diff --git a/src/entity/asset_category.ts b/src/entity/asset_category.ts
new file mode 100644
index 0000000..87b8afd
--- /dev/null
+++ b/src/entity/asset_category.ts
@@ -0,0 +1,43 @@
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+  UpdateDateColumn,
+  DeleteDateColumn,
+  OneToMany,
+} from 'typeorm';
+import { Goods } from './goods';
+
+@Entity('categories')
+export class AssetCategory {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({
+    nullable: false,
+    length: 128,
+  })
+  name: string;
+
+  @Column({
+    nullable: true,
+    length: 255,
+  })
+  description: string;
+
+  @OneToMany(() => Goods, (goods) => goods.category_id)
+  goods: Goods[];
+
+  @Column()
+  @CreateDateColumn()
+  created_at: Date;
+
+  @Column({ nullable: true })
+  @UpdateDateColumn()
+  updated_at: Date;
+
+  @Column({ nullable: true })
+  @DeleteDateColumn()
+  deleted_at: Date;
+}
diff --git a/src/entity/goods.ts b/src/entity/goods.ts
index 0ff8721..df31510 100644
--- a/src/entity/goods.ts
+++ b/src/entity/goods.ts
@@ -13,6 +13,7 @@ import {
 import { Status } from '../types/status';
 import { User } from './users';
 import { Supplier } from './supplier';
+import { AssetCategory } from './asset_category';
 
 @Entity('goods')
 export class Goods {
@@ -31,6 +32,13 @@ export class Goods {
   })
   description: string;
 
+  @Column({
+    nullable: false,
+    length: 64,
+    unique: true, // Ensure the item code is unique
+  })
+  item_code: string;
+
   @Column({
     nullable: false,
     type: 'decimal',
@@ -45,6 +53,10 @@ export class Goods {
   })
   quantity: number;
 
+  @ManyToOne(() => AssetCategory, (category) => category.goods, { nullable: true })
+  @JoinColumn({ name: 'category_id' })
+  category: AssetCategory;
+
   @Column({
     nullable: true,
     type: 'uuid',
@@ -62,7 +74,18 @@ export class Goods {
   })
   created_by: string;
 
-  @ManyToOne(() => Supplier, { nullable: false }) 
+  @ManyToOne(() => User, (user) => user.id, { nullable: true })
+  @JoinColumn({ name: 'updated_by' })
+  updatedBy: User;
+
+  @Index()
+  @Column({
+    nullable: true,
+    type: 'uuid',
+  })
+  updated_by: string;
+
+  @ManyToOne(() => Supplier, { nullable: false })
   @JoinColumn({ name: 'supplier_id' })
   supplier: Supplier;
 
diff --git a/src/index.ts b/src/index.ts
index e4098da..a75161a 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -37,6 +37,7 @@ import { SummarizeLog } from "./entity/summarize_log";
 import { SummarizeLogStatus, SummarizeType } from "./types/summarize";
 import { Goods } from "./entity/goods";
 import { Supplier } from "./entity/supplier";
+import { AssetCategory } from "./entity/asset_category";
 import { TelegramBody, TelegramResponseSend } from "./types/telegram";
 import { Ledger } from "./entity/ledgers";
 import { CreditCompany } from "./entity/credit_companies";
@@ -92,6 +93,7 @@ export {
     SummarizeType,
     Goods,
     Supplier,
+    AssetCategory,
     Ledger,
     CreditCompany,
     CreditDebtor,